102720101 has 4 divisors (see below), whose sum is σ = 112058304. Its totient is φ = 93381900.

The previous prime is 102720089. The next prime is 102720119. The reversal of 102720101 is 101027201.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-102720101 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (102720181) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4669085 + ... + 4669106.

It is an arithmetic number, because the mean of its divisors is an integer number (28014576).

Almost surely, 2^102720101 is an apocalyptic number.

102720101 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

102720101 is a deficient number, since it is larger than the sum of its proper divisors (9338203).

102720101 is an equidigital number, since it uses as much as digits as its factorization.

102720101 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9338202.

The product of its (nonzero) digits is 28, while the sum is 14.

The square root of 102720101 is about 10135.0925501448. The cubic root of 102720101 is about 468.3298211371.

Adding to 102720101 its reverse (101027201), we get a palindrome (203747302).

The spelling of 102720101 in words is "one hundred two million, seven hundred twenty thousand, one hundred one".